Tooth-fillings



(in Model.)

W. F. DAVISON.

. TOOTH FILLINGS. No. 603,179. Patented Apr. 26, 1898-.

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ATTORNEYS,

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UNITED STATES PATENT FFICE.

WILLIAM F. DAVISON, OF RICHMOND, VIRGINIA.

TOOTH-FILLINGS.

SPECIFICATION forming part of Letters Patent N 0. 603,179, dated April 26, 1898.

I Application filed November 9, 1897. Serial No. 657,921. (No specimens.)

To all whom it may concern.-

Be it known that I, WILLIAM FERDINAND DAVISON, a citizen of the United States, residing at Richmond, in the county of Henrico and State of Virginia, have invented certain new and useful Improvements in Tooth-Fillings, of which the following is a specification.

The object of the invention is to provide a simple and effective tooth-filling which answers all the requirements of a perfect filling, such as no other known process possesses,

the filled tooth having all the advantages of a tooth filled with gold or other metal, as well as additional advantages.

In filling teeth with gold as practiced at present the entire cavity is filled with the gold, foil or pellets of cohesive gold by steps so well known as to need no description.

The mode of practicing my invention is as follows: The cavity is first prepared in the usual manner and then nearly filled with the cement. 1 While the cement is yet plastic, I insert gold therein in some form and then allow the cement to-harden. The'exposed sur face of this firmly-seated gold will thus constitute an anchor to which the outer filling of gold maybe applied in the usual manner. The anchor thus described may be formed by a series of gold pins or posts seated in the cement with a layer of cohesive gold'pellets or foil condensed over the cement and between the pins or posts, which are then bent down over the cohesive layer thus formed.

The outer filling of gold may then be applied in the ordinary manner.

If preferred, the anchor may be formed ofa single tubular post or ring embedded in the cement and projecting far enough beyond to engage the outer filling of gold.

Another manner of carrying out my invention and forming the foundation for the outer filling is to insert ordinary gold. pellets into the plastic cement and packing them firmly around the cavity under the enamel. After the cement has hardened the anchor thus formed will form a surface to which the outer gold filling may be applied.

My invention, in other words, includes the inserting of gold anchors into the soft cement, allowing the same to harden and thus form a firm and solid foundation for the outer gold that is applied after the cement has hardened.

In the drawings filed herewith, Figure 1 shows a tooth with its cavity containing the cement and the pins or posts. Fig. 2 shows the same with the layer of cohesive gold over the cement andbetween the pins. Fig. 3 shows the finished filling. Fig. 4 shows a vertical section of Fig. 2. Fig. 5 shows a tooth in which a tubular post or ring is insertedin the cement. Fig. 6 shows the same with the layer of cohesive gold applied around and within the tubular post or ring. Fig. 7 shows a tooth in which the anchor is formed of gold pellets inserted in the cement and condensed or packed just under the enamel and over the surface of the soft cement.

A is the cement filling; B, the pins or posts of Fig. 1; B, the tubular post of Fig. 5; B the anchor of Fig.6 0 is the layer of co hesive gold in Figs. 1 and 2, C the same in Fig. 6, and D is the outer gold filling.

In conclusion I would state that my process possesses the following advantages over that usually followed: 7

First. Security of retention is absolutely assured.

Second. Frail teeth may be saved that cannot receive a solid-metal filling, the cement strengthening the frail walls.

Third. Ohildrens teeth and other'teethof a soft nature may be effectively filled and saved.

Fourth. A firm solid base or foundation is formed for building on gold to restore losttooth structure.

Fifth. An absolute waterproof joint is formed, thus avoiding all leakage.

Sixth. Less time is required for perfect fillmg. I

,. Seventh. Less gold is required.

Eighth. A non-conductor is between the metal and dentine, thus assuring a comfortable filling in deep cavities.

Ninth. "Cavities may be filled that are inaccessible for the old way. 1

Tenth. No retaining-points are necessary and less excavating is required, as the cement holds more firmly than metal. 7

In practice I preferto furnish the anchorage I claim as new, and desire to secure byLctters in the form of strips or posts. It may be by Patent, isseparate posts, as shown in Fig. 1, or by slit- A filling composed of cement for its base, ting the tube B (shown in Fig. 5) by scissors strips having an anchorage in said base and 15 5 or otherwise to form the separate strips. In gold over the cement and pressed or Welded the use of such construction after the cement into union with the ends of said strips subhas hardened, I supply the cohesive gold from stantially as described. time to time and successively bend down and XVILLIAM F. DAVISON. weld in the posts until the filling is finally Vitnesscs:

10 completed. SoLoN O. KEMON,

Having thus described my invention what PERRY l3. 'lURPlN. 

